D.C. Mun. Regs. tit. 14, § 5726
5726.1 Retroactive rent charges, determined in accordance with § 5719 of this subtitle, shall be due in full within thirty (30) days of notification.
5726.2 Partial payments of amounts due may be authorized by the Project Owner if it is determined that the tenant's failure to promptly report the change(s) in income, which resulted in the retroactive rent, was not willful.
SOURCE: Final Rulemaking at 64 DCR 12956 (December 22, 2017); as amended by Final Rulemaking published at 66 DCR 6831 (June 7, 2019).